Table 1.
Demographic characteristics of intussusception cases (BC level 1) and matched controls; comparison among study groups (n = 388)
| Characteristic | Cases (n = 116) | Population-based controls (n = 272) | Comparison among study groups (cases vs. controls) |
|---|---|---|---|
| Caucasian | n/N (%) 105/115 (91.3) |
n/N (%) 254/272 (93.4) |
Chi-Square test χ = 0.5200 p = .4708 |
| Gender Male Female |
n (%) 82 (70.7) 34 (29.3) |
n (%) 186 (68.4) 86 (31.6) |
Chi-Square test χ = 0.2027 p = .6526 |
| Age (days)a | Median (Min–Max) 218.0 (44–363) |
Median (Min–Max) 219.5 (44–363) |
Two-sample t-test t value = −0.14, df = 386, p = .8899 |
| Birthweight (g) | Median (Min–Max) 3,500 (2,150–4,390) |
Median (Min–Max) 3,540 (1,400–5,050) |
Wilcoxon two-sample test Z value = −1.1817, p = .2373 |
| Length at birth (cm) | Median (Min–Max) 52 (45–56) |
Median (Min–Max) 52 (40–60) |
Two-sample t-test t value = 0.20, df = 385, p = .8423 |
n number; N total number of participants with available information; Min minimum; Max maximum; BC Brighton Collaboration criteria for intussusception; level 1 highest level of diagnostic certainty; aage at index date: cases: date of symptom onset, controls: day of life on which the matching case experienced first symptoms of intussusception.